Distributer for screening apparatus.



R. W. DULL. DISTRIBUTER FOR SCREENING APPARATUS. APPLICATION-FILED 00w. 6, 1909.

1,037,221, Patented Sept. 3, 1912.

COLUMBIA PLANuaRAm-l COU WASHINBTON. D. c.

ratus for this purpose having means RAYMOND W. DULL, 0F AURORA, ILLINOIS.

DISTBIBUTER FOR SCREENING APPARATUS.

Specification of Letters Patent.

Patented Sept. 3,1912.

Application filed October 6, 1909. Serial No. 521,248.

To all whom 2'25 may concern Be it known that I, RAYMOND W. DULL, a citizen of the United States of America, and resident of Aurora, Kane county, Illinois, have invented a certain new and useful Improvement in Distributors for Screening Apparatus, of which the following is a specification.

My invention contemplates a simple and highly efficient apparatus for distributing materials on screens.

In the handling of crushed stone, for example, the stone is delivered by a conveyer or elevator at a certain place, and is thereby concentrated at one point. This interferes with the screening operation, and tends to limit the size of the screens.

My invention contemplates an apparatus for spreading the crushed stone over a wide area, the distributers being even, or substan tially so, thus insuring a better screening action, and making possible the use of larger screens. y I

It also contemplates a distributing appafor regulating the flow therein to control the action thereof.

I In the accompanying drawings, Figure 1 is a vertical section, on line 11 in Fig. 2, of a distributing apparatus embodying the principles of my invention. Fig. 2 is a vertical section on line 22 in Fig. 1.

As thus illustrated, the crushed stone or other material is delivered by a belt or con veyer A .of any suitable character. The said stone is received in a hopper B the bottom of which is formed by a series of plates 6 arranged in stepped relation to each other. These plates thus form two sets of steps, the two sets coming together at their tops and leading downward in opposite directions. These plates are supported only at their ends, and thus provide openings or passages between them. There is an opening between each step and the one above or below it. The

top step or plate 79 is broader than the others. An adjustable plate 5 is mounted below and against the under side of each plate 6. These plates 6 are movable or adjustable to practically vary the area of the upper surfaces of the plates 6. Any suitable means can be used for supporting the Plates 6 for this purpose. For example, they can, as shown, be mounted in any suitable manner to slide out and in to increase ordiminish the width of the shelves, the ends of the plates being supported in guides 6 i The screens C and D are arranged below.

the said distributing plates Z), and at right angles thereto. These screens come close to gether at their upper edges, and slope downward in opposite directions. A horizontal plate E is interposed between the upper edges of these screens.

In operation, the crushed stone falls from the conveyer A upon the plates 6, b and 6 forming a prism-shaped accumulation. on each plate. When these accumulations have been formed, then the stone which falls thereon flows down ateach side of said plates. Part of the stone flows down the outside of each prism of stone, and the other portion flows down the inside thereof. Thus,

before reaching the screens all of the stone passesbetween the plates 6, falling from the inner edge of each plate in a thin sheetor stream. The aggregate of these streams reaches entirely across the screens, so thatv the sheet of stone flowing over each screen is evenly distributed over the entire area thereof. The stone will also form in prism shape on the plate E, and then the stone that follows willroll off onto the screens. These prisms of stone protect the iron plates 6, b?

and b and E against wear. The impact and friction is all on the prisms of stone, and not on the said plates. The size of the openings between the prisms is varied by changing the size of the prisms. This is done .by adjusting the plates 5 below the plates 7) to vary the area of the latter.

Thus it will be seen that by my invention I provide eflicient means for distributing the stone or othermaterials over the surface of' the screens. The arrangement can be such thatall of the stone or other material will be deflected in one direction by a single screen, as, for example, by the screen C. Any suitable arrangement of one or more screens canbe employed without departing from my invention.

The openings between the plates are of equal size or capacity, or substantially so, in order that the streams of falling material may be of the same size or volume, or'substantially so, thus insuring even distribution in all directions over the surface of the screens.

The screening apparatus is stationary,

and involves inclined screens, as previously explained, whereby the evenly distributed material is screened by a sliding or gravity.

action on the screens. The distributing mechanism is also statlonary, and between this mechanism' and the screens thereis a support to which the distributed material. is fed. a This support forms an accumulationof material thereon, and the subsequently falling and evenly distributed" material is deflectedby this accumulation and caused to slide downward uponthe screens. Thus the impact of the fallingmaterial: is not sustained by. the screens, but is taken up or absorbed by the accumulation of thematerial by'thesupport on the upperend of the two screens. There is no agitation, and gravity takes care of the feedingand screening action to which the material is subjected from the time it is deliveredto-thedistribut-- ingmechanism until it is discharged from the screening apparatus. 7 With further respect to the regulation of the flow, by means ofthe'adjustable plates 6 it will be seen that this is ofconsiderable importance, for

this'reason: That in order to obtain a uniform distribution of the material over the entire surface or area of the screen, it is essential that the flow be regulated in such mannerthat the-stream of material descend 'ing from one shelf or plate to'another, will be sufficient in quantity to reach the lowermost shelf or plate. It must not go beyond this pointthat is to say, it must not be sufficient in quantity to accumulate atthe. lower most shelf or step of, the series, .or' otherwise there'will be danger, of cloggingand improper distribution. Theshelvesor steps produce deflections fromthe main stream of material; WlllCll deflections are of equalvolume, and the regulationofi the flow must.

be suchthat thelast deflection is inreality all that is leftof the main stream. With this methodof" distributing the materials over a stationary iscreen, it is not only un-a necessary to fill the closure or housing 1n which they two series'of shelves or steps are located, but. it is important that this be avoided, as 1n such case therewould be a large volume of stationary material which *nnght cause clogging and stop theoperas tion of: the distribnter entirely. If the materialbelng fedbythe belt or other device is coming slowly, then the openings between the shelves-or steps must be correspondingly reduced 1n size, in order to insure having some of the material reach the lowermost step or shelf at each side. 0n the other hand, if the material is coming faster, then 7 the flow regulating mechanism, consisting of the plates 6 mustzbe adjusted to providesomewhat larger openings for. the. deflectlons from the two main streams of descend- 1ng material, as otherwise there would be an. overflow of materialiatl the lower end of each series: of shelves'or steps, resulting in good results. a b 7 What I claim; as'my invention is:

an accumulation whichiin time would grow .to. snchproportions that it might entirely fill the closure or housing in which the distributer is contained. Withthis arrange gmentgitwillbe seen that each screen is'de- .sirably inclined about a horizontal axis which is; at-. right-angles to the horizontal axis ofinclinatlon of the stepped series of plates. A'lso, means are provided for dam- ",iiiiiig the lower end of each stream, inlthe manner shown, or in any suitable' way, to prevent the stream from escaping anywhere except through the openings formed; by the inner edges oft'h'e'plates. This, I find,g1ves l. A'stationary screenand means for disto each other that said openings are not closedby accumulation ofmaterial thereon.

2. A stationary screeneandmeansfor disftributing material thereon, comprising two series of plates, each series sloping down ward awayfrom the other, the-plates being "arranged in stepped relation to each other,

thus providing two upwardly convergingse- 'ries ofdistributing; openings between them,

with aclear space below, which; openings are-of. the same, or substantially thesame,

size or capacity, said openings being dis :posed at different heights, each plate adaptedtohold anaccumulation oft-he material,

jtoprevent wearing away of the plates, said plates being so disposed relative to each other that said openings are not closed by accumulation of material thereon.

3. A stationary screen andlneans fordistributingmaterial thereon, comprising a seriesof shelves arrangedin stepped: relation .to' each; other, to provlde a series of distributing openings between them, each shelf being stationary and adaptedto hold'a quantity; of the m aterial' thereon, and means for varying the supportmg'area. of said shelves, to change the size of SZLlCl openings byvarying'the height ofthe material on the shelves,

each shelf havingan inner discharge edge and an outer edge for feeding the'material tothenext lower shelf. 7 p

it. A stationaryscreen and a distributer therefor, comprising a series of stepped plates of equal size for distributing material evenly across the top of said screen, by formlng streams of material, which streams therefor, comprising stationary means for are deflections of equal volume from the same constantly decreaslng main stream flowing from plate to plate, and means for regulating the flow by changing the size of said streams, whereby the last deflection is always the final portion of the main stream.

5. A stationary screen and a distributer forming a main flow of material by gravity, to produce an inclined stream, having pro VlSlOIlS for produclng separate deflections of equal volume from the bottom of the main ing main stream flowing from plate to plate,

said deflections occurring at intervals in the direction of flow of the main stream, and

means for feeding the material to the said stepped plates, the number and size and relation of said plates being such that the last deflection, with a given rate of feed, is the final portion of the main stream.

7. A stationary screen and a distributer therefor, comprising stationary means for forming a main flow of material by gravity, having provisions for producing separate deflections of equal volume from the main flow, at regular intervals along the length thereof, disposed in position to deliver said deflections at regular intervals along the surface of a given area, and means for feeding the material to said stationary means, the said stationary means being so adjusted that, with a given rate of feed, the last deflection is the final portion of the main flow.

8. In a screening apparatus, the combination of a stationary screen, and a stationary distributer for delivering the material thereto, and for evenly spreading the same thereon, and means operative without changing the position of the distributer as a whole for adjusting the parts of the distributer relative to each other to keep the screening action coextensive with the area of the screen.

9. In a screening apparatus, the combination of a stationary screen, a stationary distributer for delivering the material thereto, and for evenly spreading the same thereon, a feeder for delivering the material to the distributer, the feeder being of less area than the screen, and means operative without changing the posltion of the distributer as a whole foradjusting the parts ofthe distributer relative to each other to keep the screening action coextensive with the area of the screen.

10. A stationary screen and a delivering and distributing apparatus therefor, comprising a stationary distributer, and means on the distributer for controlling the flow and regulating the distribution of-the material, said means comprising plates having stationary edges for feeding the material from one plate to another, and movable edges for feeding deflected portions of said material on to the screen. i

11. A stationary screen and a delivering and distributing apparatus therefor, comprising a stationary distributer having a series of feed openings, a feeder for delivering the material to the distributer, and means on the distributer for controlling the flow and regulating the distribution of the material, said means comprising mechanism for changing the size of each one of the series of feed openings which are successively encountered by the material falling from said feeder.

12. A stationary screen and a distributer therefor, comprising a series of steps for forming a main inclined stream of certain volume, and for successively deflecting portions of said stream downwardly therefrom,

which deflections may be of equal volume, each step having a fixed portion for delivering to the nextstep, and each step having an adjustable portion for discharging the deflection.

13. A stationary screen and a dist-ributer therefor, comprising a series of steps for forming a main inclined stream of certain volume, and for successively deflecting portions of said stream downwardly therefrom, which deflections may be of equal volume, and means for regulating the flow of said deflections without changing the angle of the said stream.

14. A stationary screen and a distributor therefor, comprising an inclined series of steps forming distributinv openings between them, means for feeding a stream of material down the inclined series of steps, to form deflections which fall inward from said openings directly onto said screen, and means for damming the lower end of the said stream, to compel the flnalportion of said stream to fall inward.

15. A stationary screen and a distributer therefor, comprising an inclined series of steps forming distributing openings between them, means for feeding a stream of material down the inclined series of steps, means for damming the lower end of the said stream, and means for adjusting the distributer to change the size of said openings.

t ee.

screen, an inclined. series of stepped plates 15.- material over said plates, said openings be '16., A stationary, screen anda distributer therefor, comprising: aninclined series of steps forming distrib'utinggopenings between them, means for, feeding a stream of ma- ,terial 'down. the inclined series; of steps,

means for damming the lower end of the said stream, andmeans in the distributer foradjusting, each opening independently of the others. 7 V e 17}; The combination of .a stationary ingv of the same size and thereby, producing deflections of equal volume from; the said stream, and said; screen; receiving said deflections directly andzat different points over the surface thereof..

18. The combination of a stationary V screen, an inclined; series of stepped= plates above said screen, said plates providing a series of distributingopeningsbetween them,

means for maintaining, a downwardly. fiow ingastream ofmaterial over said plates, and means for adjusting the said openings in accordance with the sizeor character of the said stream.

19. The combination of a stationary screen, an-inclinedi series of stepped plates above? said screen, said plates providing a I seri es of distributing openingsbetween them, 7 and means for maintaininga downwardly.

ffiowing stream of material over said plates,

said screen being'inclined about. a. horizontal axis extending at, right-angles to the horizontal axis; of inclination ofsaid series of plates 1 20.; The; combination of a stationary screen, an inclined series of stepped plates 21. The, combination of a stationary screen, an inclined series of stepped plates above said screen, said plates providing a series of distributed openings between 7 them, means for maintaining a downwardly flowing; stream of material over said plates,.and means for adjusting the said openingsin accordance with the size or character of the saidstream, said'screen beinginclined about an axis at right angles to the axis of inclination of said series of plates.

Signed by me at Chicago, Illinois, this 21st day of September, 1909. RAYMOND W. DULL. Witnesses: V v

WM. 13. DUIMoN, E. H. GLEGG.

Copies of this patent may be-obtained folfive cents each; by addressing. the Commissioner of Patents.

Washington, 11.03" 

